WO2019050380A1 - Procédé de récupération de faisceau dans un système de communication sans fil, et dispositif associé - Google Patents

Procédé de récupération de faisceau dans un système de communication sans fil, et dispositif associé Download PDF

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Publication number
WO2019050380A1
WO2019050380A1 PCT/KR2018/010645 KR2018010645W WO2019050380A1 WO 2019050380 A1 WO2019050380 A1 WO 2019050380A1 KR 2018010645 W KR2018010645 W KR 2018010645W WO 2019050380 A1 WO2019050380 A1 WO 2019050380A1
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resource
csi
block
information
base station
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PCT/KR2018/010645
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English (en)
Korean (ko)
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강지원
김기준
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엘지전자 주식회사
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Priority to EP18854806.9A priority Critical patent/EP3644677A4/fr
Priority to KR1020187038064A priority patent/KR102156286B1/ko
Priority to US16/332,351 priority patent/US10784950B2/en
Priority to JP2020509502A priority patent/JP7110328B2/ja
Priority to CN201880046656.3A priority patent/CN110915276B/zh
Publication of WO2019050380A1 publication Critical patent/WO2019050380A1/fr
Priority to US16/996,571 priority patent/US11329713B2/en

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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
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    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
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Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method of performing beam recovery and a device supporting the same.
  • the mobile communication system has been developed to provide voice service while ensuring the user 's activity.
  • the mobile communication system has expanded the area from voice to data service.
  • Due to an explosion of traffic a shortage of resources is caused and users demand a higher speed service. Therefore, a more advanced mobile communication system is required .
  • next-generation mobile communication system largely depend on the acceptance of explosive data traffic, the dramatic increase in the rate per user, the acceptance of a significantly increased number of connected devices, very low end-to-end latency, Should be able to.
  • a dual connectivity a massive multiple input multiple output (MIMO), an in-band full duplex, a non-orthogonal multiple access (NOMA) wideband support, and device networking.
  • MIMO massive multiple input multiple output
  • NOMA non-orthogonal multiple access
  • a method for performing beam failure recovery in a wireless communication system comprising: receiving control information associated with a candidate beam setting for beam failure recovery from a base station Wherein the control information includes a RS set including a reference signal (RS) associated with candidate beam identification and a threshold for beam failure recovery; Selecting an RS having a quality equal to or higher than the threshold value among RSs associated with the candidate beam identification; And transmitting a beam failure recovery request to a base station based on UL (uplink) resources associated with the selected RS.
  • RS reference signal
  • the UL resource is a resource related to a PRACH (physical random access channel).
  • the UL resource is a PRACH preamble.
  • the UL resource is a contention-free physical random access channel (PRACH) preamble.
  • PRACH physical random access channel
  • the RS set includes at least one of a synchronization signal (SS) block or at least one channel state information (CSI) -RS.
  • SS synchronization signal
  • CSI channel state information
  • the selected RS is an SS block.
  • the UL resource associated with the selected RS is a UL resource corresponding to the SS block.
  • the selected RS may be a CSI-RS
  • the UL resource is a UL resource corresponding to an SS block that is quasi-co-located with the CSI-RS.
  • the SS block is an SS block QCL obtained from the CSI-RS and a spatial Rx parameter.
  • the SS block is directly associated with the UL resource, and the CSI-RS is indirectly associated with the UL resource through the QCL association with the SS block .
  • the quality is RSRP (reference signal received power).
  • the UL resource is associated with one SS block and is associated with one or more CSI-RSs.
  • the present disclosure relates to a method for performing beam failure recovery in a wireless communication system, the method being performed by a base station, comprising the steps of: receiving control information associated with a candidate beam setup for beam fail-
  • the control information including a RS set including a reference signal (RS) associated with candidate beam identification and a threshold for beam fail recovery; And receiving a beam failure recovery request from the terminal on UL (uplink) resources associated with a particular RS.
  • RS reference signal
  • the specific RS is an RS having a quality equal to or higher than the threshold value among the RSs associated with the candidate beam identification.
  • the present invention also relates to a terminal performing beam failure recovery in a wireless communication system, comprising: a radio frequency module for transmitting and receiving a radio signal; And a processor operatively coupled to the RF module, wherein the processor receives from a base station control information associated with a candidate beam setup for beam fail recovery, the control information including candidate beam identification An RS set including an associated reference signal (RS) and a threshold for the beam failure recovery; Selecting an RS having a quality equal to or higher than the threshold value among RSs associated with the candidate beam identification; And to transmit a beam failure recovery request to the base station based on UL (uplink) resources associated with the selected RS.
  • a radio frequency module for transmitting and receiving a radio signal
  • a processor operatively coupled to the RF module, wherein the processor receives from a base station control information associated with a candidate beam setup for beam fail recovery, the control information including candidate beam identification
  • An RS set including an associated reference signal (RS) and a threshold for the beam failure recovery
  • the present specification has the effect of performing the beam failure recovery procedure by designing resources for setting a new beam and for requesting beam failure recovery in case of beam failure.
  • FIG. 1 is a diagram showing an example of the overall system structure of NR to which the method suggested in the present specification can be applied.
  • FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present invention can be applied.
  • FIG. 3 shows an example of a resource grid supported in a wireless communication system to which the method proposed here can be applied.
  • FIG. 4 shows examples of resource ports of an antenna port and a ringer by which the method proposed in the present invention can be applied.
  • FIG. 5 shows an example of a block diagram of a transmitter composed of an analog beamformer and an RF chain.
  • FIG. 6 shows an example of a block diagram of a transmitting end composed of a digital beamformer and an RF chain.
  • FIG. 8 is a diagram illustrating an example of a PUSCH CSI reporting mode.
  • FIG. 9 is a diagram illustrating an example of a PUCCH CSI reporting mode.
  • FIG. 10 shows an example of network operation depending on whether or not there is a replacement beam.
  • FIG. 11 is a diagram showing an example of a beam-related setting method.
  • FIG. 12 is a flowchart showing an example of a method for performing beam restoration.
  • FIG. 13 is a flowchart showing an example of the operation of a terminal performing beam restoration.
  • FIG. 14 is a flowchart showing another example of the operation of the terminal performing beam restoration.
  • 15 is a flowchart showing an example of a beam failure recovery procedure.
  • 16 is a diagram illustrating an example of spatial coverage of a CSI-RS and an SS block that can be applied to the method proposed in this specification.
  • FIG. 18 is a flowchart showing an example of a method of operating a base station for beam failure recovery proposed in the present specification.
  • FIG. 19 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present invention.
  • FIG. 20 illustrates a block diagram of a communication apparatus according to an embodiment of the present invention.
  • FIG. 22 is a diagram showing another example of an RF module of a wireless communication apparatus to which the method suggested in the present specification can be applied.
  • a base station has a meaning as a terminal node of a network that directly communicates with a terminal.
  • the particular operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station.
  • BS base station
  • BS refers to a term such as a fixed station, a Node B, an evolved NodeB, a base transceiver system (BTS), an access point (AP), a gNB (generation NB) Lt; / RTI >
  • a 'terminal' may be fixed or mobile and may be a mobile station (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS) Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC), Machine-to-Machine (M2M), and Device-to-Device (D2D) devices.
  • UE mobile station
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS Subscriber station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • a downlink means communication from a base station to a terminal
  • an uplink means communication from a terminal to a base station.
  • the transmitter may be part of the base station, and the receiver may be part of the terminal.
  • the transmitter may be part of the terminal and the receiver may be part of the base station.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC- single carrier frequency division multiple access
  • CDMA can be implemented with radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA can be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • OFDMA can be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA).
  • UTRA is part of the universal mobile telecommunications system (UMTS).
  • 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, the steps or portions of the embodiments of the present invention which are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document.
  • 3GPP LTE / LTE-A / NR New RAT
  • the eLTE eNB is an eNB evolution that supports connectivity to EPC and NGC.
  • gNB node that supports NR as well as connection to NGC.
  • New RAN A wireless access network that supports NR or E-UTRA or interacts with NGC.
  • Network slice is a network defined by an operator to provide an optimized solution for a specific market scenario that requires specific requirements with end-to-end coverage.
  • Network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.
  • NG-C Control plane interface used for NG2 reference point between new RAN and NGC.
  • NG-U User plane interface used for NG3 reference points between new RAN and NGC.
  • Non-standalone NR A configuration in which gNB requests an LTE eNB as an anchor for EPC control plane connection or an eLTE eNB as an anchor for control plane connection to NGC.
  • Non-stand-alone E-UTRA A deployment configuration in which the eLTE eNB requires the gNB as an anchor for the control plane connection to the NGC.
  • User plane gateway Endpoint of the NG-U interface.
  • the NG-RAN comprises gNBs providing a control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE do.
  • RRC control plane
  • the gNBs are interconnected via the Xn interface.
  • the gNB is also connected to the NGC via the NG interface.
  • the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and a UPF (User Plane Function) through an N3 interface.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • the memoryless can be defined by the subcarrier spacing and the CP (Cyclic Prefix) overhead.
  • the plurality of subcarrier intervals are set to a constant N (or alternatively, ) ≪ / RTI >
  • the utilized memoryless can be chosen independently of the frequency band.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the size of the various fields in the time domain is Lt; / RTI > units of time. From here, ego, to be.
  • the downlink and uplink transmissions are And a radio frame having a duration of.
  • FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present invention can be applied.
  • the transmission of the uplink frame number i from the User Equipment (UE) is shorter than the start of the corresponding downlink frame in the corresponding UE You have to start before.
  • Not all terminals can transmit and receive at the same time, meaning that not all OFDM symbols of a downlink slot or an uplink slot can be used.
  • Table 2 & , And Table 3 shows the number of OFDM symbols per slot for a normal CP Represents the number of OFDM symbols per slot for an extended CP in the slot.
  • An antenna port, a resource grid, a resource element, a resource block, a carrier part, and the like are associated with a physical resource in the NR system. Can be considered.
  • the antenna port is defined such that the channel on which the symbols on the antenna port are carried can be deduced from the channel on which the other symbols on the same antenna port are carried. If a large-scale property of a channel on which a symbol on one antenna port is carried can be deduced from a channel on which symbols on another antenna port are carried, the two antenna ports may be quasi co-located (QC / QCL) quasi co-location relationship.
  • the broad characteristics include at least one of a delay spread, a Doppler spread, a frequency shift, an average received power, and a received timing.
  • FIG. 3 shows an example of a resource grid supported in a wireless communication system to which the method proposed here can be applied.
  • Subcarriers if the resource grid is in the frequency domain Subcarriers, and one subframe consists of 14 x 2 u OFDM symbols, but is not limited thereto.
  • And antenna port p can be set to one resource grid.
  • FIG. 4 shows examples of resource ports of an antenna port and a ringer by which the method proposed in the present invention can be applied.
  • each element of the resource grid for antenna port p is referred to as a resource element, ≪ / RTI > From here, Is an index in the frequency domain, Quot; refers to the position of a symbol in a subframe.
  • a resource element in a slot From here, to be.
  • a physical resource block is a block in the frequency domain Are defined as consecutive subcarriers. On the frequency domain, .
  • a terminal may be configured to receive or transmit using only a subset of the resource grid. At this time, a set of resource blocks set to be received or transmitted by the UE is set to 0 .
  • Physical uplink control signaling should be able to carry at least hybrid-ARQ acknowledgment, CSI report (including beamforming information if possible), and scheduling request.
  • At least two transmission methods are supported for the uplink control channel (UL control channel) supported by the NR system.
  • UL control channel uplink control channel
  • the uplink control channel may be transmitted in a short duration around the last uplink symbol (s) transmitted in the slot.
  • the uplink control channel is time-division-multiplexed and / or frequency-division-multiplexed with the uplink data channel (UL data channel) in the slot.
  • UL data channel uplink data channel
  • Short uplink control information (UCI) and data are transmitted between the UE and the UEs in at least a short UCI and a physical resource block (PRB) - multiplexed.
  • UCI uplink control information
  • PRB physical resource block
  • TDM Time Division Multiplexing
  • At least a short-term PUCCH over the 2-symbol duration of the slot is supported.
  • the subcarrier interval between the DL / UL data and the PUCCH of the short term is the same in the same slot.
  • At least a semi-static configuration is supported in which the PUCCH resources of a given terminal in a slot, i.e. short PUCCHs of different terminals, can be time-division multiplexed within a given duration in a slot.
  • the PUCCH resource includes a time domain, a frequency domain, and, if applicable, a code domain.
  • a 'short UCI' Can be frequency-division multiplexed by the terminal of the base station.
  • the uplink control channel may be transmitted in a long-term over a plurality of uplink symbols to improve coverage.
  • the uplink control channel is frequency-division multiplexed with the uplink data channel in the slot.
  • a UCI carried by a long duration UL control channel with a low PAPR can be transmitted in one slot or a plurality of slots.
  • - Transmission using multiple slots is allowed for a total duration (e.g. 1 ms) in at least some cases.
  • TDM time division multiplexing
  • the long UL part of the slot can be used for long-time PUCCH transmission. That is, the long time PUCCH is supported for both the UL-only slot and the slot having a variable number of symbols consisting of at least four symbols.
  • the UCI may be repeated in N slots (N > 1), and the N slots may be contiguous or non-contiguous in slots in which long time PUCCHs are allowed .
  • Simultaneous transmission of PUSCH and PUCCH is supported for at least a long PUCCH (long PUCCH). That is, uplink control on the PUCCH resource is transmitted even when data exists.
  • UCI on PUSCH is supported.
  • the TDM and FDM between the short term PUCCH and the long term PUCCH are supported for the other terminals in at least one slot.
  • the PRB (or multiple PRBs) is the minimum resource unit size for the UL control channel.
  • frequency resources and hopping may not spread to carrier bandwidth.
  • the UE-specific RS is used for NR-PUCCH transmission.
  • the set of PUCCH resources is set by higher layer signaling and the PUCCH resources in the set are indicated by downlink control information (DCI).
  • DCI downlink control information
  • the timing between data reception and hybrid-ARQ acknowledgment transmission should be dynamically (at least with RRC) indication.
  • the combination of a semi-static configuration and dynamic signaling (for at least some types of UCI information) is used to determine the PUCCH resource for the 'long and short PUCCH format'.
  • the PUCCH resource includes a time domain, a frequency domain, and, if applicable, a code domain.
  • the time interval between scheduling request (SR) resources set for the UE may be smaller than one slot.
  • beam management is defined as follows.
  • Beam measurement the operation of the TRP (s) or UE to measure the characteristics of the received beamforming signal.
  • - Beam reporting An operation in which the UE reports the information of the beamformed signal based on beam measurements.
  • Beam sweeping An operation that covers the spatial region with the beam transmitted and / or received during a time interval in a predetermined manner.
  • Tx / Rx beam correspondence in the TRP and UE is defined as follows.
  • Tx / Rx beam correspondence in the TRP is maintained if at least one of the following is true:
  • the TRP may determine a TRP receive beam for uplink reception based on the UE ' s downlink measurement for one or more transmit beams of the TRP.
  • the TRP may determine the TRP Tx beam for the downlink transmission based on the uplink measurement of the TRP for one or more Rx beams of the TRP.
  • the Tx / Rx beam correspondence at the UE is maintained if at least one of the following is true:
  • the UE may determine the UE Tx beam for uplink transmission based on the UE ' s downlink measurement for one or more Rx beams of the UE.
  • the UE may determine a UE receive beam for downlink reception based on an indication of a TRP based on uplink measurements on one or more Tx beams.
  • the capability indication of information related to the UE beam is supported by the TRP.
  • the following DL L1 / L2 beam management procedures are supported within one or more TRPs.
  • P-1 Used to enable UE measurement for different TRP Tx beams to support selection of TRP Tx beam / UE Rx beam (s).
  • TRP In the case of beamforming in TRP, it typically includes an intra / inter-TRP Tx beam sweep in different beam sets.
  • TRP For beamforming at the UE, it typically includes a UE Rx beam sweep from a different set of beams.
  • P-2 Used to allow UE measurements for different TRP Tx beams to change inter / intra-TRP Tx beam (s).
  • P-3 UE measurement for the same TRP Tx beam is used to change the UE Rx beam when the UE is using beamforming.
  • At least apriiodic reporting triggered by the network is supported in P-1, P-2 and P-3 related operations.
  • the UE measurement based on RS for beam management (at least CSI-RS) consists of K (total number of beams) beams, and the UE reports the measurement results of the selected N Tx beams.
  • N is not necessarily a fixed number.
  • Procedures based on RS for mobility purposes are not excluded.
  • the reporting information includes a measurement quantity for N beams (s) and information representative of N DL transmission beams if at least N ⁇ K.
  • the UE may report N' CRI (CSI-RS resource indicator).
  • the UE may be set to the following higher layer parameters for beam management.
  • - P-3 can be supported with or without reporting settings.
  • reporting setting that includes at least:
  • time domain operations e.g., aperiodic, periodic, semi-persistent
  • Time domain operation (eg, aperiodic, cyclic, semi-persistent)
  • Each CSI-RS resource set includes K? 1 CSI-RS resources (some parameters of the K CSI-RS resources may be the same, eg, port number, time domain behavior,
  • NR supports the next beam report considering L group with L> 1.
  • NR supports that the UE can trigger a mechanism to recover from beam failure.
  • a beam failure event occurs when the quality of the beam pair link of the associated control channel is sufficiently low (for example, a comparison with a threshold value, a timeout of the associated timer).
  • the mechanism to recover from beam failure (or failure) is triggered when a beam failure occurs.
  • the network explicitly configures the UE with resources for transmitting UL signals for recovery purposes.
  • the configuration of resources is supported where the base station listens from all or some directions (e.g., random access region).
  • a UL transmission / resource reporting a beam failure may be located at the same time instance as the PRACH (the resource orthogonal to the PRACH resource) or at another time instance (configurable for UE) with the PRACH.
  • the transmission of the DL signal is supported so that the UE can monitor the beam to identify new potential beams.
  • NR supports beam management regardless of the beam-related indication. If a beam-related indication is provided, information about the UE-side beamforming / receiving procedure used for CSI-RS based measurements may be indicated to the UE via QCL.
  • the QCL parameters to be supported by the NR will include parameters for delay, Doppler, average gain, etc. used in the LTE system as well as spatial parameters for beamforming at the receiving end.
  • NR supports the use of the same or different beams in the control channel and the corresponding data channel transmission.
  • the UE may be configured to simultaneously monitor NR-PDCCH on M beam-pair links.
  • the maximum value of M? 1 and M may depend on at least the UE capability.
  • the UE may be configured to monitor the NR-PDCCH on different beam-pair link (s) in different NR-PDCCH OFDM symbols.
  • the parameters associated with UE Rx beam configuration for monitoring the NR-PDCCH on multiple beam-pair links are configured by higher layer signaling or MAC CE and / or considered in the search space design.
  • NR supports the indication of the spatial QCL hypothesis between the DL RS antenna port (s) and the DL RS antenna port (s) for demodulation of the DL control channel.
  • the candidate signaling method for beam indication for the NR-PDCCH includes MAC CE signaling, RRC signaling, DCI signaling, specification transparent and / or implicit methods, and combinations of these signaling methods to be.
  • NR For reception of a unicast DL data channel, NR supports the indication of the spatial QCL hypothesis between the DL RS antenna port and the DMRS antenna port of the DL data channel.
  • Information indicating the RS antenna port is indicated via DCI (downlink grant). This information also indicates the DMRS antenna port and the RS antenna port being QCL.
  • a different set of DMRS antenna ports for a DL data channel may be represented as a different set of RS antenna ports and a QCL.
  • the analog beamforming technique is a beamforming technique applied to the initial multi-antenna structure. This technique divides an analog signal that has been subjected to digital signal processing into a plurality of paths, forms a beam by applying a phase shift (PS) and a power amplifier (PA) setting to each path It can mean.
  • PS phase shift
  • PA power amplifier
  • PA and PS connected to each antenna process analog signals derived from a single digital signal.
  • the PA and the PS process complex weights.
  • an RF chain refers to a processing block in which a baseband (BB) signal is converted into an analog signal.
  • BB baseband
  • the accuracy of the beam is determined according to the characteristics of the PA and the PS, and may be advantageous for narrowband transmission due to the control characteristics of the device.
  • the multiplexing gain for increasing the transmission rate is relatively small because the system is configured with a hardware structure that is difficult to implement multiple stream transmission. Also, in this case, it may not be easy to form a beam for each UE based on orthogonal resource allocation.
  • beamforming may be performed as precoding is performed in the BB process.
  • the RF chain includes PA. This is because, in the case of digital beamforming techniques, the complex weights derived for beamforming are directly applied to the transmitted data.
  • the transmitting end when the digital beam forming technique described above is applied in a large MIMO environment, the transmitting end must perform signal processing for hundreds of antennas through a BB process for digital signal processing. Accordingly, the complexity of signal processing becomes very large, and the RF chain as many as the number of antennas is required, so that the complexity of hardware implementation can be greatly increased.
  • the transmitting end needs independent channel estimation for all antennas.
  • the pilot requires feedback information on a large MIMO channel composed of all antennas, so that the pilot and / or feedback overhead can be very large.
  • the degree of increase in performance using multiple antennas is very small, and the flexibility of resource allocation can be reduced. In particular, it is not easy to control the beam for each frequency in the broadband transmission.
  • a hybrid type transmission terminal configuration scheme combining analog beam forming and digital beam forming structures is required instead of exclusive selection of one of analog beam forming and digital beam forming techniques.
  • analog beamforming can be used at the pure analog beamforming transceiver and at the hybrid beamforming transceiver. At this time, the analog beam scanning can perform estimation for one beam at the same time. Therefore, the beam training time required for beam scanning is proportional to the number of all candidate beams.
  • Equation (2) t s means the time required for one beam scanning, K T means the number of transmission beams, and K R means the number of reception beams.
  • Figure 7 illustrates an example of an analog beam scanning scheme in accordance with various embodiments of the present invention.
  • Fig. 7 is merely for convenience of description and does not limit the scope of the present invention.
  • L time intervals (P 1 to P L ) .
  • the terminal feeds back the identifier (e.g., ID) of the beam having the highest signal strength to the base station. That is, as the number of individual beams increases as the number of transmitting / receiving antennas increases, a longer training time may be required.
  • Analog beamforming changes the size and phase angle of a continuous waveform in the time domain after a DAC (digital-to-analog converter), so that unlike digital beamforming, a training interval for an individual beam needs to be guaranteed . Therefore, as the length of the training interval increases, the efficiency of the system may decrease (i.e., the loss of the system may increase).
  • CSI Channel state information
  • the base station transmits the data signal based on the received CSI information from the terminal.
  • the UE feeds back a high CQI value, and the Node B will transmit the data using a relatively high modulation order and a low channel coding rate. In the opposite case, the UE feeds back a low CQI value, The data will be transmitted using a relatively low modulation order and a high channel coding rate.
  • the PMI feedback is preferred precoding matrix information provided to the base station in order to provide a guide as to which MIMO precoding scheme to apply when the base station has multiple antennas.
  • the MS estimates a downlink MIMO channel between the BS and the MS based on the pilot signal and recommends what MIMO precoding the BS should apply through PMI feedback.
  • the BS and the MS share a codebook composed of a plurality of precoding matrices, and each MIMO precoding matrix in the codebook has a unique index.
  • the UE minimizes the feedback information amount of the UE by feeding back the index corresponding to the most preferred MIMO precoding matrix in the codebook as PMI.
  • the PMI value does not have to be a single index.
  • the final 8tx MIMO precoding matrix can be derived only by combining two indexes (first PMI and second PMI).
  • RI feedback is the number of preferred transmission layers provided to a base station for the purpose of providing a guide for the number of preferred transmission layers when multi-layer transmission is possible through spatial multiplexing with a base station and a terminal equipped with multiple antennas Information.
  • RI has a close relationship with PMI. This is because the base station must be able to know what precoding should be applied to each layer according to the number of transmission layers.
  • PMI codebook can be defined based on single layer transmission, and PMI can be defined for each layer.
  • this method has a disadvantage in that the amount of PMI / RI feedback information increases significantly as the number of transmission layers increases .
  • a PMI codebook is defined according to the number of transmission layers. That is, N number of size Nt x R matrices are defined in the codebook for R-layer transmission (where R is the number of layers, Nt is the number of transmit antenna ports, and N is the size of the codebook).
  • the size of the PMI codebook is defined regardless of the number of transmission layers.
  • the PMI / RI is defined as the rank value (RI) because the number of transmission layers (R) matches the rank value of the precoding matrix (Nt x R matrix).
  • the PMI / RI described in this specification does not necessarily mean the rank value of the precoding matrix and the index value of the precoding matrix expressed by the Nt x R matrix like PMI / RI in the LTE system.
  • the PMI described herein represents preferred MIMO precoder information among the MIMO precursors applicable in the transmission terminal, and the form of the precoder is not limited to a linear precoder that can be represented by a matrix as in the LTE system.
  • the RI described herein includes all of the feedback information indicating the preferred number of transmission layers in a wider sense than the RI in LTE.
  • the CSI information may be obtained in the entire system frequency domain or in some frequency domain.
  • it may be useful to obtain and feedback CSI information for some frequency regions (e.g., subbands) preferred for each UE.
  • CSI feedback is performed through an uplink channel.
  • periodic CSI feedback is performed through a physical uplink control channel (PUCCH), and aperiodic CSI feedback is transmitted through a physical uplink shared channel (PUSCH) Lt; / RTI >
  • PUSCH physical uplink shared channel
  • Non-periodic CSI feedback means that the base station temporarily feeds back only when it desires CSI feedback information, and the base station triggers CSI feedback through a downlink control channel such as PDCCH / ePDCCH.
  • the CSI feedback when the CSI feedback is triggered, it is divided into the PUSCH CSI reporting mode as shown in FIG. 8, which information is to be fed back by the UE, and the PUSCH CSI reporting mode, Let me know in advance.
  • FIG. 8 is a diagram illustrating an example of a PUSCH CSI reporting mode.
  • the PUCCH CSI reporting mode is also defined for periodic CSI feedback via PUCCH.
  • FIG. 9 is a diagram illustrating an example of a PUCCH CSI reporting mode.
  • the time of transmitting the CQI and the PMI are different from the time of transmitting the RI.
  • reporting mode 1-0 only the RI is transmitted at a specific PUCCH transmission time, and the wideband CQI is transmitted at another PUCCH transmission time.
  • a PUCCH reporting type is defined according to the type of CSI information configured at a specific PUCCH transmission time. For example, in the above example, a reporting type for only RI corresponds to type 3, and a reporting type for transmitting only wideband CQI corresponds to type 4.
  • the RI feedback period and the offset value and the CQI / PMI feedback period and the offset value are set to the UE through the upper layer message.
  • the CSI feedback information is included in uplink control information (UCI).
  • UCI uplink control information
  • pilot or RS reference signal
  • Measurement RS Pilot for measuring channel conditions
  • CSI measurement / reporting purposes short term measurement: Link adaptation, rank adaptation, closed loop MIMO precoding
  • MBSFN RS Pilot for Multi-cast / Broadcast service
  • CRS Cell-specific RS
  • CSI-RS downlink data channel
  • PDSCH downlink data channel
  • the CSI-RS is designed for CSI measurement and feedback only and features very low RS overhead compared to the CRS.
  • the CRS supports up to four multi-antenna ports, while the CSI-RS supports up to eight multi-antenna ports.
  • the UE-specific RS is designed for demodulation of the data channel. Unlike the CRS, the MIMO precoding scheme applied to the corresponding UE is RS (precoded RS) applied to the pilot signal.
  • the UE-specific RS does not have to be transmitted by the number of antenna ports like the CRS and the CSI-RS, but may be transmitted only by the number of transmission layers (transmission rank).
  • the UE-specific RS is transmitted through the scheduler of the base station to the same resource region as the data channel resource region allocated to each UE, the UE-specific RS is characterized by the UE-specific RS.
  • CRS is cell specific because it is always transmitted in the same pattern within the system bandwidth so that all UEs in the cell can use it for measurement and demodulation purposes.
  • a Sounding RS (SRS) is designed as a measurement RS, and a Demodulation RS (DMRS) for an uplink data channel (PUSCH) and a DMRS for an ACK / NACK and an uplink control channel (PUCCH) Respectively.
  • SRS Sounding RS
  • DMRS Demodulation RS
  • the base station may send a periodic CSI report, a semi-persistent CSI report (periodic CSI reporting is activated only during a specific time interval, or a plurality of consecutive CSI reports) You may request an aperiodic CSI report.
  • the periodic and semi-persistent (SP) CSI reporting is allocated a UL (uplink) resource (e.g., PUCCH in LTE) for a CSI report at a specific period in a period during which reporting is active.
  • a UL (uplink) resource e.g., PUCCH in LTE
  • DL downlink
  • RS reference signal
  • Tx transmission / reception
  • UCI uplink control information: CSI, ACK / NACK
  • the DL beam pair determination procedure includes a procedure of (1) transmitting a DL RS corresponding to a plurality of TRP Tx beams to a terminal, (2) selecting a TRP Tx beam for selecting and / or reporting one of the DL RSs (3) a procedure in which the base station repeatedly transmits the same RS signal corresponding to each TRP Tx beam, and (4) a procedure in which the UE measures a UE Rx beam with a different UE Rx beam on the repeatedly transmitted signals, Or a combination of the procedures for selecting.
  • the UL beam pair determination procedure may include: (1) a procedure in which a terminal transmits a UL RS corresponding to a plurality of UE Tx beams, (2) a UE selects a Tx beam for selecting and / or signaling one of the UL Tx beams (3) a procedure in which the UE repeatedly transmits the same RS signal corresponding to each UE Tx beam to the base station; (4) a procedure in which the base station measures TRP Rx beams differently from the repeatedly transmitted signals, And a procedure for selecting an Rx beam.
  • the procedure for determining the other can be omitted.
  • the determination process for the DL and / or UL beam pair can be performed periodically or non-periodically.
  • the UE performs periodic or SP (Semi-Persistent) CSI reporting after the DL / UL beam pair determination process is completed.
  • SP Semi-Persistent
  • a CSI-RS including a single or a plurality of antenna ports for CSI measurement of a terminal can be beamformed to a TRP Tx beam determined as a DL beam, and the transmission period of the CSI-RS can be transmitted to a CSI report reporting period may be transmitted more frequently or more frequently.
  • the UE may transmit an aperiodic CSI-RS in accordance with the CSI reporting period or more frequently.
  • the UE may periodically transmit the measured CSI information to the predetermined UL Tx beam in the UL beam pair determination process.
  • a beam mismatch problem may occur depending on the period of beam management set in performing the DL / UL beam management process.
  • the optimal DL / UL beam pair can be changed.
  • a beam failure event occurs when the tracking fails due to the beam management process that generally performs this change by the network instruction.
  • the occurrence of such a beam failure event can be determined based on the reception quality of the downlink RS, and a report message or a beam recovery request message (hereinafter referred to as 'beam recovery request message' Quot;) must be transmitted from the terminal.
  • 'beam recovery request message' Quot a beam recovery request message
  • the beam restoration request message may be variously expressed as a beam failure recovery request message, a control signal, a control message, a first message, or the like.
  • the base station Upon receipt of the beam restoration request message from the terminal, the base station can perform beam restoration through various processes such as beam RS transmission and beam reporting request to the terminal for beam restoration.
  • Such a series of beam restoration processes will be referred to as " beam recovery ".
  • NR New Radio or New Rat
  • NR supports that the UE can trigger a mechanism to recover from beam failure.
  • the network explicitly configures the UE to resources for UL transmission of signals for recovery purposes.
  • the base station supports the configuration of resources (e.g., random access regions) that are listening from all or some directions.
  • resources e.g., random access regions
  • This mechanism needs to consider a tradeoff between performance and DL signaling overhead.
  • beam management overhead and latency should be considered during CSI-RS design for NR beam management.
  • the CSI-RS supports DL Tx beam sweeping and UE Rx beam sweeping.
  • NR CSI-RS supports the following mapping structure.
  • the NP CSI-RS port can be mapped by (sub) time unit.
  • the same CSI-RS antenna ports can be mapped over the (sub) time unit.
  • Each time unit may be partitioned in sub-time units.
  • This mapping structure can be used to support multiple panels / Tx chains.
  • the Tx beam (s) are the same across sub-time units within each time unit.
  • the Tx beam (s) varies from sub-time unit to sub-time unit within each time unit.
  • the Tx beam (s) are the same in sub time units.
  • the Tx beam (s) are different per sub time unit.
  • the beam failure recovery mechanism of the UE includes the following processes (1) to (4).
  • the UE monitors the response of the gNB to the beam failure recovery request.
  • the UE monitors the beam failure detection RS to evaluate whether or not the beam failure trigger condition is satisfied.
  • the beam failure detection RS includes at least a periodic CSI-RS for beam management.
  • a SS (Synchronization Signal) block can also be used for beam management. If an SS block is used for beam management, an SS block in a serving cell can be considered.
  • the SS block can be interpreted that the synchronous signal SS is transmitted in a slot unit or a specific time unit.
  • the beam failure detection RS includes a case of measuring the detection / demodulation quality of the associated radio channel using the RS and a Quasi Co-Location (QCL) indicator as well as measuring the quality of the corresponding RS.
  • the ID associated with the CSI-RS or the SS block designated for monitoring the (primary) PDCCH can be understood as the beam failure detection RS.
  • whether or not the beam failure event is generated indicates that the detection / demodulation performance of the corresponding PDCCH is less than a certain Can be defined.
  • the occurrence of the beam failure event may occur when the quality of the beam pair link (s) of the associated control channel falls below a certain level.
  • the quality of the beam pair link (s) of the associated control channel may be determined as a PDCCH detection performance.
  • the UE can detect the beam failure.
  • each of the multiple PDCCHs may be transmitted and / or received for different beams in different control channel regions (e.g., symbols, slots, subframes, etc.).
  • control channel region for each beam may be predefined or transmitted / received through higher layer signaling.
  • the beam failure event is generated due to the quality of the beam pair link (s) of the associated control channel, only the quality of the DL beam has fallen below a certain level, or only the quality of the UL beam has decreased to a certain level Whether or not the beam failure event has occurred or whether the quality of the DL beam and the UL beam has fallen below a certain level can be determined.
  • the predetermined level or less may be a threshold value or less, a time-out of an associated timer, and the like.
  • RS RS, SS Blocks for fine timing / frequency tracking, DM-RS for PDCCH, and DM-RS for PDSCH can be used as a signal for detecting the beam failure.
  • the UE monitors the beam identification RS to find a new candidate beam.
  • the beam identification RS comprises information on the periodic CSI-RS and SS blocks in the serving cell, if 1) periodic CSI-RS for beam management when configured by 1) NW, 2) when the SS block is used for beam management do.
  • the information carried by the beam failback request is either 1) explicit / implicit information for identifying the UE and the new gNB TX beam information, or 2) And explicit / implicit information about whether a candidate beam is present or not.
  • the transmission of the beam failure recovery request may select one of PRACH, PUCCH, PRACH-like (e.g., different parameters for the preamble sequence from the PRACH).
  • the beam failure recovery request resource / signal can be used additionally to the scheduling request.
  • the UE monitors the control channel search space to receive the gNB response to the beam failure recovery request.
  • - uses a resource that is orthogonal to at least another PRACH transmission's resource for a non-contention-based channel, FDM, based on PRACH.
  • the beam recovery request message is either (1) transmitted using the same symbols as PRACH (first), (2) transmitted using symbols other than PRACH Both mechanisms can be supported.
  • the first is that when uplink synchronization is lost due to beam failure (when the beam quality is relatively low or there is no alternative beam), and / or when the beam failure event occurs, This can be a useful mechanism if the PRACH resource is close in time.
  • the second is that when a beam failure event or uplink synchronization is not lost (beam quality is relatively low, or there is a replacement beam), and / or when a beam failure event occurs and a preset PRACH resource It may be a useful mechanism when fast beam recovery is difficult to wait on PRACH resources (eg, symbols) in the distance.
  • PRACH resources eg, symbols
  • the UE may perform an RLF (Radio Link Failure) operation if the UE fails to receive a response to the request after transmitting a beam restoration request message to the BS a predetermined number of times at the time of a beam failure.
  • RLF Radio Link Failure
  • a Beam RS (BRS) used in this specification is a downlink physical signal used for beam management, and includes CSI-RS, Mobility RS (MRS), Synchronization Signal, Lt; / RTI >
  • the Beam RS may be set (as an RRC layer message) by a resource setting on a beam management framework (or CSI framework). That is, the Beam RS can be preset by the resource setting.
  • the beam management framework is a structure that indicates a relation between Beam reporting setting (s), Beam resource setting (s), Beam resource set, and Measurement setting (s). A more detailed description will be given later.
  • beam reporting refers to feedback information of a terminal related to a beam, and may include beam quality related information and / or beam indication information.
  • the beam quality related information may be CQI (Channel Quality Information), Layer 3 RSRP, Layer 1 RSRP, or the like.
  • the beam indication information may be a CSI-RS resource indicator (CRI), a Precoding Matrix Indicator (PMI), an RS port index, or the like.
  • CRI CSI-RS resource indicator
  • PMI Precoding Matrix Indicator
  • RS port index RS port index
  • the feedback information, parameters, reporting period, granularity (e.g., wideband feedback, subband feedback) associated with the beam may be determined by a reporting setting on the beam management framework (or CSI framework) layer message).
  • the feedback information, the reporting period, the frequency unit, and the like related to the beam can be preset by the report setting.
  • Method 1 When the terminal sends a beam recovery request to a network (e.g., a base station), the network may take two actions (Method 1 and Method 2) as follows.
  • Method 1 shows the network operation when there is no alternate beam (e.g., alternate DL beam pair).
  • the method 1 is a method for transmitting a beam detection trigger to a mobile station by transmitting an aperiodic Beam RS to a mobile station (or triggering a Beam RS) and receiving an aperiodic beam reporting trigger when a network receives a beam restoration request from a mobile station will be.
  • the alternative beam may be understood as an RS set that the base station sets for periodic beam management or monitoring and may be equal to or less than a set of measurable beams.
  • the alternative beam may be RS (s) having a specific quality or more among the RSs set for beam management purposes.
  • the network may configure N CSI-RS resources for periodic beam management or monitoring to the terminal.
  • the terminal can measure the signal quality from M beamformed SS blocks (with wider coverage) as well as N CSI-RS resources. Therefore, a terminal does not have a substitute beam among the set N CSI-RSs, but may search for a substitute beam, that is, a signal of a specific quality or more, among M SS blocks.
  • the SS block is cell-specific and has periodic properties, so it is not suitable to be included in the above-described aperiodic Beam RS category which needs to be UE-specific transmitted on-demand. Therefore, this case can be regarded as a category of method 1, which requires a subsequent process of transmitting Beam RS (e.g., CSI-RS) to the UE even if there is an alternative SS block beam.
  • Beam RS e.g., CSI-RS
  • FIG. 10 shows an example of network operation depending on whether or not there is a replacement beam.
  • FIG. 10A is a diagram showing Method 1.
  • the network can trigger Beam RS and Beam reporting together using a single DCI.
  • the network transmits a Periodic Beam RS to the UE through a DL.
  • the network triggers (aperiodic) beam reporting together with the aperiodic Beam RS (according to method 1).
  • the terminal performs beam measurement through a reference resource, and reports the beam measurement result to the network.
  • Method 2 shows the network operation in the presence of an alternate DL beam pair.
  • the network when the network receives a beam restoration request from the terminal, the network performs an aperiodic beam reporting trigger as shown in FIG. 10B.
  • FIG. 10B is a diagram showing a method 2.
  • the network triggers aperiodic Beam reporting to the terminal.
  • the network does not (or does not trigger) the aperiodic Beam RS to the UE.
  • the terminal performs beam measurement through a reference resource, and reports the beam measurement result to the network.
  • a preferred Tx beam indicator and a beam quality metric may be transmitted together in the beam report process. A detailed description thereof will be described later.
  • the UE when the UE knows the DL Tx beam (or DL beam pair) information that can be replaced from the channel measured through the predetermined RS, the beam RS transmission of the network and the beam RS reception of the terminal are omitted This is a useful way to do so.
  • Method 1 which was previously discussed, is a useful method when there is no alternative beam or when the base station can not know the information on the presence or absence of the alternative beam.
  • the (Beam) reporting setting may not be distinguished.
  • the same feedback information may include, for example, a preferred DL Tx beam indicator (s) and a beam quality metric (s).
  • the preferred DL transmission beam indicator may be, for example, a beam ID, a CSI-RS Resource Indicator (CRI), an RS port index, or the like.
  • CRI CSI-RS Resource Indicator
  • the beam quality metric may be, for example, L1 RSRP, CQI, and the like.
  • the network can support at least one of the following configuration methods to the terminal through RRC signaling.
  • FIG. 11 is a diagram illustrating an example of a beam-related setting method that may be applied to the methods proposed herein.
  • a reporting setting includes one aperiodic CSI / beam reporting setting
  • a resource setting includes one aperiodic beam RS setting (eg, CSI-RS) and one periodic / semi It can include the -persistent beam RS setting.
  • a plurality of report settings can be expressed by reporting settings
  • a plurality of resource settings can be expressed by resource settings and the like.
  • a resource setting may also include one or more resource sets.
  • one measurement setting and two resource settings are linked by a link (or channel) in a measurement setting.
  • a reporting setting includes one aperiodic CSI / beam reporting setting, a resource setting includes one beam RS setting, and the beam RS setting is at least two Contains a set of resource sets.
  • s eg CSI-RS
  • s periodic / semi-persistent beam RS (s) (eg, CSI-RS)
  • the two settings are connected by one link (or channel) within the measurement setting.
  • setting method 1 is useful when time-domain behavior (aperiodic, semi-persistent (SP), periodic) is commonly set in resource setting units.
  • SP semi-persistent
  • the setting method 2 can be useful when time-domain behavior is commonly set in units of a resource set in a resource setting.
  • the UE informs the network (or the base station) of information on which of the methods 1 and 2 is preferred, or information on the presence or absence of a replacement beam from the measured RS Let's look at the method in detail.
  • control information may be included in a beam recovery request signal or a beam failure reporting signal.
  • the control information may be indicative or indication information that directly indicates presence or absence of a replacement beam, preferred link information associated with the pre-configured aperiodic beam reporting setting (in the case of the setting method 1), preferred resource setting information , Or preferred resource set information (in the case of setting method 2).
  • the control information may be transferred to the network as physical layer control information, such as UCI (Uplink Control Information) in the LTE system, or may be delivered to a higher layer message format (e.g., MAC CE).
  • physical layer control information such as UCI (Uplink Control Information) in the LTE system
  • UCI Uplink Control Information
  • MAC CE MAC Control Control Information
  • the terminal may transmit the control information using the same resource (e.g., symbol (s)) as the PRACH.
  • the same resource e.g., symbol (s)
  • the MS uses (or transmits) a CDM (Code Division Multiplexed) or FDM (Frequency Division Multiplexed) signal as the beam recovery request signal, the MS sets a sequence set ) Can be used separately.
  • CDM Code Division Multiplexed
  • FDM Frequency Division Multiplexed
  • a separated root index (es) or cyclic shift values may be used.
  • the MS uses the CDM or FDM signal as the beam recovery request signal with the PRACH
  • the same sequence set as the sequence set used in the PRACH can be used.
  • whether the signal is a PRACH or a beam restoration request signal can be distinguished by applying different time-domain / frequency-domain OCC (Orthogonal Cover Code).
  • MAC control element
  • DCI downlink control information
  • a terminal is only a reference resource that is included in a resource setting indicated by a valid link (or not indicated by an invalid link) among a plurality of pre-associated resource settings in a measurement setting. And performs beam measurement and beam measurement (beam measurement and beam reporting) for the beam measurement.
  • the terminal shall select only the RSs included in the valid resource settings (or not included in the invalid resource settings) among the plurality of resource settings pre-associated with the measurement settings as reference resources And performs beam measurement and beam reporting.
  • the terminal determines only the RS included in the valid resource set in the resource setting pre-associated with the measurement setting as the reference resource and transmits the beam measurement and the beam report .
  • the report type / mode setting information indicates indicator or instruction information indicating whether triggering of aperiodic resource and triggering of aperiodic report are instructed together or only aperiodic report triggering is indicated.
  • the report type or mode in which the triggering of the aperiodic resource and the triggering of the aperiodic report are indicated together can be expressed in the joint triggering mode or the first mode, and the report type or mode in which only the aperiodic report triggering is indicated May be expressed in a reporting triggering only mode or a second mode.
  • the UE sets up a non-periodic resource setting / resource set (resource setting) set in the RRC (setting method 1) or a resource set (setting method 2) aperiodic resource setting / resource set) as a reference resource and performs beam measurement and beam reporting.
  • the UE ignores periodic resource / semi-static resources connected with aperiodic reporting.
  • the UE sets periodic or half of the resource setting (setting method 1) / resource set (setting method 2) set in the RRC - Determine only semi-persistent resource settings / resource sets as reference resources and perform beam measurement and beam reporting.
  • the UE ignores aperiodic resources associated with aperiodic reporting.
  • the terminal reports information on which of the methods 1 and 2 is preferred by the terminal or information on the presence or absence of a substitute beam (or existence of a measured value) from the measured RS, Information (confirmation message or ACK / NACK) indicating whether the information is applicable to the terminal.
  • the information indicating whether the report information of the UE is applied to the base station includes the information of (1) to (4) May be sent when indicating aperiodic reporting triggering.
  • the UE When the UE transmits information on which of the methods 1 and 2 is preferred to the BS or information on the presence or absence of a substitute beam (or existence of a measured value) from the measured RS, Information that confirms receipt and application of information may be transmitted.
  • a base station when a base station transmits a confirmed (or ACK) message to a mobile station, it indicates that the base station determines that the mobile station applies the transmitted information.
  • the base station informs the mobile station that it will further transmit some of the information of (1) to (4) Or to retransmit information about whether the terminal prefers either of the methods 1 and 2 or information on the presence or absence of a substitute beam (or presence or absence of a measured value).
  • control information' information on which of the above methods 1 and 2 is preferred or information on the presence or absence of a replacement beam (or presence or absence of a measurement) can be simply referred to as 'control information'.
  • the information of (1) to (4) described above may be transmitted to the base station by information on which of the methods 1 and 2 the terminal desires or information on the presence or absence of a substitute beam First, it may be omitted if reported.
  • the terminal has a beam recovery request signal (or beam failure reporting signal) that (i) has a measurement of the alternate beam (or prefer method 2) to the base station either explicitly or implicitly Or implicit.
  • the UE transmits a resource setting (setting method 1) / resource set (setting method 2 (Eg, a periodic RS, an activated semi-persistent RS, or a pre-triggered resource) that is activated (or triggered or set) before a slot in which a reporting triggering message is received, -triggered aperiodic RS) as a reference resource and perform beam measurement and beam reporting.
  • a resource setting setting method 1
  • resource set setting method 2 (Eg, a periodic RS, an activated semi-persistent RS, or a pre-triggered resource) that is activated (or triggered or set) before a slot in which a reporting triggering message is received, -triggered aperiodic RS) as a reference resource and perform beam measurement and beam reporting.
  • the reference resource is determined as a specific resource activated before the slot in which the reporting triggering message is received.
  • the terminal reports the beam recovery request signal (or beam failure reporting signal) to the base station either explicitly or implicitly (ii) there is no measurement of alternate beam (or prefer method 1).
  • the UE transmits a resource setting (setting method 1) / resource set (setting method 2 (Eg, triggered / activated aperiodic RS in later slot (eg, triggered / activated) at the same slot (eg jointly triggered aperiodic RS) or at a later time (s)) as a reference resource, and perform beam measurement and beam reporting.
  • a resource setting setting method 1
  • resource set setting method 2 (Eg, triggered / activated aperiodic RS in later slot (eg, triggered / activated) at the same slot (eg jointly triggered aperiodic RS) or at a later time (s)) as a reference resource
  • the reference resource is determined to be a slot that is the same as the slot that received the reporting triggering message or a specific resource to be activated in the slot after receiving the reporting triggering message.
  • FIG. 12 is a flowchart showing an example of a method for performing beam restoration.
  • the terminal receives a beam reference signal (BRS) used for beam management from a base station (S1210).
  • BRS beam reference signal
  • the MS transmits a control signal for a beam failure recovery request to the BS in step S1220.
  • the beam failure event may be detected based on the received beam reference signal.
  • the control signal includes indication information indicating whether or not a replacement beam exists.
  • the alternative beam may refer to a reference signal having a channel quality higher than a specific channel quality among the reference signals set for beam management.
  • the terminal reports the beam measurement result to the base station in a specific resource (S1230).
  • the control signal may use the same time resource as the PRACH (Physical Random Access Channel).
  • the control signal may be transmitted through a Physical Uplink Control Channel (PUCCH).
  • PUCCH Physical Uplink Control Channel
  • the control signal may use different time and / or frequency resources, different sequence sets, and / or different UCI (Uplink Control Information) depending on the existence of the alternative beam.
  • UCI Uplink Control Information
  • the different sequence sets may be distinguished by a root sequence index or a cyclic shift value.
  • the indication information may also include information about a preferred link associated with a predetermined non-periodic beam reporting setting, information about a preferred resource setting associated with a preset aperiodic beam reporting setting, Or information about a preferred resource set associated with a preset aperiodic beam reporting setting.
  • the terminal may receive an indication message from the base station indicating the triggering of the beam report.
  • the beam report may be triggered based on the indication message.
  • the indication message includes information relating to a valid or invalid link in settings pre-associated with a measurement setting, information associated with the measurement setting in advance information associated with a resource setting that is valid or not valid within a set of settings that are valid or invalid within a set of predefined settings, information associated with the set of beam-report mode or beam-beam-mode setting information.
  • the measurement settings may be linked by one report setting and two resource settings, respectively, or by one report setting and one resource setting.
  • the beam-report mode setting information may indicate a first mode in which transmission of an aperiodic beam reference signal and an aperiodic beam report are triggered together, or a second mode in which only an aperiodic beam report is triggered.
  • the first mode indicates a joint triggering mode
  • the second mode indicates a reporting triggering only mode
  • the specific resource may be a resource setting set in an RRC (Radio Resource Control) or a non-periodic resource setting among a resource set or an aperiodic resource Lt; / RTI >
  • RRC Radio Resource Control
  • the specific resource may be a slot that is the same as the slot that received the instruction message, or a resource that is enabled to enable beam measurement after the slot in which the instruction message was received.
  • the specific resource may be a periodic or semi-fixed resource setting or resource set among resource sets or resource sets set to RRC.
  • the specific resource may be a resource activated to enable beam measurement before the slot in which the instruction message is received.
  • the terminal may receive a response to the report from the base station.
  • the UE may retransmit information including at least one of the indication information or the indication message to the BS.
  • a part or all of the beam report information may be differentiated according to the type of the UL resource performing the beam recovery request and / or the setting of the UL resource, Let's look at how to do it together.
  • the beam recovery request may be expressed as beam failure reporting.
  • the beam reporting information may include, for example, a preferred DL Tx beam indicator (s), a beam quality metric (s) (eg L1 RSRP, CQI) .
  • a preferred DL Tx beam indicator s
  • a beam quality metric eg L1 RSRP, CQI
  • the preferred DL Tx beam indicator (s) may include, for example, a beam ID, a CSI-RS Resource Indicator (CRI), an RS port index, a synchronization signal block (SSB) index, a PBCH DMRS index, .
  • CRI CSI-RS Resource Indicator
  • SSB synchronization signal block
  • the beam quality metric (s) may be, for example, L1 RSRP, CQI, and the like.
  • aperiodic beam reporting triggering process of the base station and beam reporting process of the subsequent UE are omitted in the setting method 2 of the method 2 (method 2) And can be defined as 'setting method 3'.
  • the method of reporting a part of the beam report information includes not only a method of reporting only a part of information but also a method of transmitting coarse information (or information of lower granularity).
  • a L1 RSRP transmitting with beam failure reporting may include (or allocate) a smaller number of bits than a L1 RSRP transmitting through a subsequent beam reporting process, quantization level.
  • the base station may cause the terminal to calculate and report (difference in beam failure) the amount of reporting information relative to the reported value reported at a previous time (beam failure).
  • the terminal may transmit a differential CQI, differential RSRP with a beam failure report.
  • the resources that transmit beam recovery request (BRR) in the NR system are PRACH, Code Division Multiplexing (CDM), or Frequency Division Multiplexing (FDM) )
  • a UL resource using a PRACH and another time resource hereinafter, referred to as 'UL type II'
  • 'UL type II' another time resource
  • the UL type I may be set to a slot type / configuration (e.g., UL slot) having a relatively high UL resource, such as PRACH, and the UL type II may be set to a slot having a small UL resource such as a PUCCH have.
  • a slot type / configuration e.g., UL slot
  • PRACH Physical Uplink Control Channel
  • the UL type I may be separately set PRACH preamble for beam restoration request (or beam failure report request).
  • PRACH can be used for beam restoration request, and the PRACH can be a contention-free (or non-contention) based PRACH or a contention based PRACH.
  • the contention-free based PRACH resource (s) can be FDM or CDM with other contention-free based PRACH resource (s) (using the same time or frequency resources but different sequence).
  • the UL type I may be PRACH preambles set for a BFRQ request, and the UL type II may be short / long PUCCH resources.
  • the UE can report the beam quality (L1-RSRP) only when transmitting the BFRQ using the UL type II.
  • the PUCCH is divided into two types (short PUCCH or long PUCCH).
  • the Short PUCCH is composed of one or two symbols, and can be located at the rear of the slot and can transmit UNC (uplink control information) of up to several tens of bits.
  • the long PUCCH is composed of 4 to 12 symbols (or 14 symbols), and can transmit a UCI of several hundreds of bits at most.
  • the UL type II may be transmitted through a PUSCH, a short / long PUCCH, or a separately defined uplink channel.
  • the UL type II may be more preferably transmitted using the short PUCCH and / or the long PUCCH have.
  • 'A and / or B' can be interpreted to have the same meaning as 'including at least one of A or B.
  • the base station may assume to apply Rx beam sweeping (forward direction) to receive the corresponding signal (beam restoration request signal).
  • the beam restoration request signal is designed to have a structure in which a small amount of information is repeatedly transmitted, because a signal is received only in a time / frequency resource corresponding to a specific beam.
  • the UL type I is set to include only the beam reporting information that does not include the additional beam reporting information (the preferred DL transmission beam indicator, beam quality metric) or the number of bits that is less than the UL type II .
  • the setting method 3 (of the method 2) is not supported.
  • PUCCH type short PUCCH or long PUCCH
  • PUCCH resource size number of symbols and / or PRB size
  • the beam information that can be sent through the long PUCCH may transmit the corresponding L1 RSRP as well as the RS indicator for beam identification, but the L1 RSRP may be omitted for the beam information that can be sent via the short PUCCH .
  • the short PUCCH may be designed or defined such that the additional beam reporting information is not included.
  • supported beam report information may be designed differently according to the (number of) short / long PUCCH symbols.
  • the short PUCCH may be undesirable semi-staticly allocated (or set) to the RRC because it is designed to be fast ACK / NACK designed.
  • the UL type II is transmitted only on the long PUCCH.
  • a specific UL resource set to a period 'N' may be a PRACH resource and a CDM or FDM in a cycle of N times an integer multiple, and may be TDM with a PRACH resource in the remaining points.
  • the information configuration transmitted from the corresponding resource can be configured the same regardless of the reporting time point.
  • the feedback information of the implicit / explicit indication of the presence or absence of the alternative beam may be included in the beam report information in a differential (or differential) manner according to the type and / or setting of the UL resource. Or may be transmitted with a beam recovery request.
  • the base station since the base station will receive a signal in all directions and only support a small feedback payload, the base station transmits a beam recovery request (Including setting method 1 and / or setting method 2).
  • the base station since the base station will receive a signal in a specific direction, it is defined that it is used only when there is an alternative beam, so that it does not transmit the presence information of the alternative beam together with the beam recovery request, (And the beam quality information) for beam identification (the setting method 2 and / or the setting method 3 are supported).
  • the BS may implicitly acquire the DL beam information for the UE according to the UL resource information transmitted by the UE.
  • the base station can implicitly identify which DL Tx beam corresponding to which DL resource is of superior quality (as an alternative beam).
  • FIG. 13 and 14 are flowcharts showing an example of the operation of the terminal performing beam restoration.
  • the terminal receives a beam reference signal used for beam management from the base station (S1310).
  • the MS determines an uplink (UL) resource for transmitting a control signal related to a beam failure recovery request (S1320).
  • the UL resource may be a Type 1 resource using the same time resource as a PRACH (Physical Random Access Channel), or a Type 2 resource using a different time resource from the PRACH.
  • PRACH Physical Random Access Channel
  • the Type 2 resource may be a Physical Uplink Control Channel (PUCCH) resource or a Physical Uplink Shared Channel (PUSCH) resource.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the PUCCH resource may be at least one of a short PUCCH or a long PUCCH.
  • the MS transmits the control signal to the BS in the determined UL resource (S1330).
  • control signal may include some or all of the information associated with the beam report, or may not include information related to the beam report.
  • the control signal includes only a part of the information related to the beam report, and the information related to the beam report may include information on the presence or absence of the alternative beam.
  • the alternative beam may refer to a reference signal having a channel quality higher than a specific channel quality among the reference signals set for the beam management.
  • the control signal may include all of the information associated with the beam report.
  • the information related to the beam report may include at least one of beam identification information for beam identification or beam quality information indicating beam quality.
  • the terminal reports the beam measurement result to the base station in a specific resource (S1440).
  • the reporting of the beam measurement result may be performed when beam reporting is triggered.
  • S1410 to S1430 in Fig. 14 are the same as S1310 to S1330 in Fig.
  • 15 is a flowchart showing an example of a beam failure recovery procedure.
  • the BFR procedure includes the steps of (1) Beam failure detection step S1510, (2) New beam identification step S1520, (3) Beam failure recovery request step S1530, and (4) And monitoring (S1540).
  • step S1530 that is, for the BFRQ transmission, a PRACH preamble or a PUCCH may be used.
  • step S1510 that is, beam failure detection
  • the beam failure instance When the block error rates (BLER) of all the serving beams are above the threshold, it is called the beam failure instance.
  • the RSs (qo) monitored by the UE are explicitly set by the RRC or implicitly determined by the beam RS for the control channel.
  • the indication to the higher layer is not performed.
  • Beam failure is declared when N consecutive beam failure instances occur.
  • N is the NrofBeamFailureInstance parameter set by the RRC.
  • 1-port CSI-RS and SSB are supported for BFD RS set.
  • step S1520 a new beam indication will be described.
  • the PRACH sequence is mapped to at least one new candidate beam.
  • the UE selects a new beam among the candidate beams having a threshold of L1-RSRP equal to or higher than the threshold set by the RRC, and transmits the PRACH through the selected beam.
  • which beam is selected by the terminal may be a terminal implementation issue.
  • steps S1530 and S1530 that is, the monitoring of the response to the BFRQ transmission and the BFRQ, will be described.
  • the UE can set a dedicated CORESET by the RRC to monitor the time duration of the window and the response of the BS to the BFRQ.
  • the UE starts monitoring after 4 slots of the PRACH transmission.
  • the UE assumes that the dedicated CORESET is the DL RS of the UE-identified candidate beam and the spatial QCL in the beam failure recovery request.
  • the terminal aborts the BFR procedure.
  • the maximum number of PRACH transmissions and the timer are set to RRC.
  • SSB SS block
  • the entire bitmap (8 bits) is used for the indication of the actual SS / PBCH block transmission.
  • UE-specific RRC signaling with full bitmaps may be used to indicate the SS blocks actually transmitted for both the 6 GHz (sub-6 GHz) case and the 6 GHz and above (over-6 GHz) case.
  • the indication is in compressed form above 6 GHz, and the indication method is selected from the following alternatives.
  • Groups are defined as consecutive SS / PBCH blocks.
  • An intra-group bitmap may indicate which SS / PBCH block is actually transmitted in the group, each group having the same transmission pattern of the SS / PBCH block, the group-bitmap indicating which group is actually transmitted can do.
  • [8] + [8] bits for 8 groups and 8 SS / PBCH blocks per group For example, [8] + [8] bits for 8 groups and 8 SS / PBCH blocks per group.
  • Groups are defined as consecutive SS / PBCH blocks.
  • a group-bitmap indicates which group is actually transmitted, the SS / PBCH blocks in the group are logically consecutive, and the number of actually transmitted SS / PBCH blocks is the number of logically consecutive SS / PBCH Indicates whether blocks are actually transmitted starting from the first index, and the number is applied in common to all groups being transmitted.
  • Groups are defined as consecutive SS / PBCH blocks.
  • An intra-group bitmap can indicate which SS / PBCH block is actually transmitted within the group, each group having the same pattern of SS / PBCH block transmission and the actual number of groups transmitted is how many consecutive groups Starting from the first group and indeed being transmitted.
  • Groups are defined as consecutive SS / PBCH blocks.
  • the group-bitmap can indicate which groups are actually transmitted, whether the SS / PBCH blocks in the group are logically consecutive, and how many SS / PBCH blocks actually transmitted for each group are logically continuous SS / PBCH Indicates whether blocks are actually transmitted starting from the first index.
  • Groups are defined as consecutive SS / PBCH blocks.
  • the group-bitmap can indicate which group is actually transmitted and whether all SS / PBCH blocks in the group being transmitted are actually transmitted.
  • [8] bits for 8 groups per group and 8 SS / PBCH blocks For example, [8] bits for 8 groups per group and 8 SS / PBCH blocks.
  • Indicated resources are reserved for the actually transmitted SS blocks.
  • Data channels are rate-matched around the actually transmitted SS blocks.
  • Beam failure is declared only when all serving control channels fail.
  • the SS block in the serving cell may be used for new candidate beam identification.
  • the following options may be configured for new candidate beam identification.
  • SSB is not set for new candidate beam identification.
  • the CSI-RS is not set for new candidate beam identification.
  • PRACH Physical random access channel
  • CDM code division multiplexed
  • FDM frequency division multiplexed
  • CDM means the same sequence design as the PRACH preamble.
  • the PRACH preamble for beam fail recovery request transmission is selected from the preamble for the contention-free PRACH operation of Rel-15.
  • a reference signal may refer to a radio signal such as a synchronization signal (SS), an SS block, and a physical channel.
  • 'setting' used in the present specification may be interpreted to have the same meaning as 'instruction' or 'designation'.
  • the SS block used in the present specification can be interpreted in the same meaning as the SS / PBCH block and the SSB.
  • An SS block as well as a CSI-RS may be used to identify the new candidate beam.
  • the DL RSs that the UE searches for a new candidate beam i.e. a beam of better quality than the current serving DL RS, can be explicitly configured by the network.
  • another required DL RS configuration indicates which UL resource can be used.
  • a non-beam correspondence in which the correspondence between the transmission beam and the reception beam does not coincide with each other, when the UE uses some uplink beam through the above-described uplink beam management process, Can be grasped in advance.
  • the downlink beam is good or bad, if it is determined that the uplink beam should be transmitted using the uplink beam, if the base station makes an agreement between the base station and the terminal, There is no problem in understanding whether this is good or bad.
  • the UE may be configured with multiple beam failure recovery request resources (BFRs).
  • BFRs beam failure recovery request resources
  • the BFR refers to PRACH and FDM, CDM, or TDM UL resources to be used for beam failure recovery request.
  • each BFR may be associated with the DL beam (s) similar to the PRACH.
  • the PRACH resource can be associated with the SS block or the CSI-RS.
  • each BFR may be associated with a DL beam (s).
  • the following two DL RS configurations may be required for beam recovery.
  • Proposal 1 shows that, for UEs having beam correspondence, the UE can set a plurality of BFRs by radio resource control (RRC).
  • RRC radio resource control
  • each BFR may be associated with an SS block or a CSI-RS.
  • the beam failure recovery request resource can refer to PRACH and FDM, CDM, or TDM resources to be used for beam failure recovery requests.
  • the BFR may be a PRACH preamble.
  • the PRACH preamble may be a contention-free PRACH preamble.
  • the DL RS indication for the BFR (corresponding to the DL RS set setting 2), if the DL RS connected to (or corresponding to) one of the BFRs is an SS block, one SS block is indicated.
  • One or more CSI-RS resource (s) may be characterized. That is, only one SSB can be connected to one BFR, and one or more CSI-RS resources can be connected.
  • one SSB is associated (or linked) to one BFR may mean that the same RA preamble is not mapped to different SSBs.
  • the beam width of the CSI-RS is narrower than the beam width of the SS block, a plurality of CSI-RS beams can be gathered to have a beam width corresponding to one SS block.
  • the BFR is CDM or FDM with the PRACH for other purposes
  • a general terminal capable of applying only one transmission beam at a time to CDM or FDM-transmitted PRACH resources can transmit the same transmission beam to the corresponding BFR and PRACH resources Should be applied.
  • the DL RS configuration (DL RS set configuration 1) for new beam identification may be independent of the DL RS configuration (DL RS set configuration 2) for association with the BFR.
  • the DL RSs associated with the BFR may be measured and utilized by the UE even if it is not explicitly included as a new beam candidate. That is, the DL RS resources explicitly or implicitly included in the DL RS set setting 2 can be included as a new beam candidate RS even if they are not explicitly included in the DL RS set setting 1.
  • DL RS set setting 2 For example, in the BFR, only the SS block resources are set to the associated RS (DL RS set setting 2), and only the CSI-RSs are set (DL RS set setting 1) for the explicit new beam RS setting.
  • the UE can still measure the SS blocks as a new beam RS regardless of the DL RS set (DL RS set set 1) set for new candidate beam identification.
  • the DL RS type used in the BFR indication (the type of RS included in the DL RS set setting 2) and the network set to search for a new candidate beam in beam failure recovery
  • the DL RS type (the type of RS included in the DL RS set setting 1) may be different.
  • the DL RS type used for the BFR indication is 'SS / PBCH block'
  • the DL RS type set by the network may be (periodic) CSI-RS resources, or vice versa.
  • the candidate beam set may be different.
  • the DL RS set (DL RS resources included in the DL RS set setting 1) that the base station sets to utilize in the beam failure recovery when searching for the candidate beam, as well as the BFR indication
  • the DL RS set (DL RS set included in DL RS set setting 2) set up in the DL-UL relationship can also be found.
  • the new candidate beam RS resource list found by the UE may include all the resources of the DL RS set setting 2, but the inverse relationship may not be established. That is, the DL RS resources included in the DL RS set setting 2 may not include all the new candidate beam RS resource lists.
  • the terminal reports a preferred candidate beam, or when the base station indicates an alternate beam, for the RS set of electrons (when reporting candidate beams) and the RS set of the latter (when the base station indicates alternate beams)
  • the RS set of electrons when reporting candidate beams
  • the RS set of the latter when the base station indicates alternate beams
  • the 'DL RS set' set by the BS to utilize in the beam failure recovery may be the 'RS set' (periodically set) for the base station (for beam management purposes).
  • the beam management purpose is to indicate the resource type explicitly or implicitly through a resource setting or a resource set setting, or through a related reporting parameter.
  • the typical reporting parameters for beam reporting include CSI-RS resource ID, CSI-RS resource ID, CSI-RS port ID, and SS block ID, which correspond to the parameters that can refer to the Tx beam ID of the base station, (RSRP), a channel quality indicator (CQI), and the like, which indicate the quality of the received signal.
  • CSI-RS resource ID CSI-RS resource ID
  • CSI-RS port ID CSI-RS port ID
  • SS block ID which correspond to the parameters that can refer to the Tx beam ID of the base station, (RSRP), a channel quality indicator (CQI), and the like, which indicate the quality of the received signal.
  • the UE may implicitly transmit information about the BFR-related beam to the base station by transmitting an SS block replacement beam ID to the corresponding BFR .
  • the CSI-RS beam ID (and beam quality information) (having a narrower beam width) is transmitted through the BFR or a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) Lt; / RTI > to the base station.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • the CSI-RS resources (sets) performing the explicit reporting need to understand common indexing between the BS and the UE.
  • the UE when the UE reports an alternative CSI-RS beam, it is required to determine (or set) which CSI-RS resource (s) to report to the base station based on indexing.
  • the CSI-RS indexing is performed by: (1) following CSI-RS resource set indexing for periodic CSI-RS based periodic beam reporting, (2) using CSI-RS resource (set) Indexing can be set separately.
  • the network may reset the aperiodic CSI-RS to perform the associated beam report.
  • the existence of the alternative beam among the predetermined (periodic) CSI-RS resources can be indirectly known through the QCL (Quasi-Co Location) relationship between the CSI-RS and the SS block (in terms of the spatial RX parameter).
  • 'QCL relation indication from the viewpoint of spatial RX parameter' may mean receiving (or transmitting) corresponding signals in the same or similar beam direction.
  • NR is spatially QCL between specific DL RS resources indicates that the corresponding DL RSs are identical in terms of specific spatial domain parameters (eg, dominant angle of departure) As shown in FIG.
  • the transmission beam that is, the spatial domain filer does not have to be the same between the DL RSs spatially QCLed. For example, if one beam is included in the coverage of one beam for two beams with the same or similar beam direction but with different beam widths, then the optimal receive beam for the terminal will be the same with a high probability, It is also acceptable to indicate the spatial QCL relationship between DL RSs to which the beam is applied.
  • SSB # 0, # 1, # 2 and # 3 are connected to BFR # 0, # 1, # 2 and # 3 respectively and CSI- # 0 and QCL are instructed, and the CSI-RS resource (set) ⁇ # 2, # 3 ⁇ is instructed with SSB # 1 and QCL.
  • the terminal assumes that the serving beam (which transmits the DL control channel) is directed to SSB # 0.
  • the signal is transmitted to the BS through the BFR # 1 connected to the SSB # 1 .
  • the same terminal operation can be performed even when a substitute beam is found in the CSI-RS resource (set) # 2 or # 3.
  • BFR # 3 can be used to send a signal to implicitly inform the network.
  • the corresponding terminal may know that there is no alternative beam among predetermined CSI-RSs.
  • the base station when it detects a signal in BFR # 0 or BFR # 1, it may perform beam reporting (according to predetermined indexing) in a preset CSI-RS.
  • the base station can perform beam reporting based on the indexing while resetting the CSI-RS.
  • the base station transmits a (non-periodic) CSI-RS (non-periodic) signal indicating whether to perform beam ID reporting based on a predetermined (periodic) CSI- It is necessary to explicitly or implicitly indicate to the terminal whether to perform beam ID reporting based on a set ID.
  • the DCI field for simultaneously triggering aperiodic reporting and aperiodic RS / resource is indicated, the latter is recognized as a beam ID report based on an aperiodic CSI-RS resource (set) ID , a beam ID report based on a periodic CSI-RS resource (set) ID if a DCI field triggering only aperiodic reporting is indicated.
  • SS block resources are also possible to include some or all of the separately indicated SS block resources as candidate beams through RMSI, SIB, UE-specific RRC setting for initial access or mobility for SS block Do.
  • 8 bit full bitmap for SS block can be used, or compact form can be used by using group-bitmap as mentioned above.
  • the SS block set can be used (or reported or indicated) together with the RS set that the network searches for a new candidate beam in case of beam failure recovery.
  • the SS block set may be overridden with RSs to be used for candidate beam identification after receipt of the corresponding indication.
  • base station eg gNB
  • the following two options are possible, and the options need to be supported in NR.
  • Option 1 is the case where the spatial coverage (or beam width) of the CSI-RS resource for beam management is narrower than the spatial coverage of the SS block.
  • Option 2 is when the spatial coverage (or beam width) of the CSI-RS resource for beam management is the same as the spatial coverage of the SS block.
  • the spatial coverage of the SS block may be covered by multiple CSI-RS resources, each having a different beamforming direction.
  • the network may provide a sufficient number of BFRs to each UE, for example, to cover the entire cell area.
  • a small set of BFRs can be set for each UE.
  • the UE can use CSI-RS There is no need to search for beams.
  • the CSI-RS resources may be shared between multiple UEs, the CSI-RS may be UE-specific so that the overhead of RS / measurement / reporting may be optimized for the UE.
  • the aggregated spatial coverage of the set periodic CSI-RS resources may be narrower than the aggregated spatial coverage of the SS blocks of the serving cell.
  • 16 is a diagram illustrating an example of spatial coverage of a CSI-RS and an SS block that can be applied to the method proposed in this specification.
  • 1610 represents spatial coverage by SSB
  • 1620 represents spatial coverage by CSI-RS.
  • FIG. 16 shows an implementation (or configuration) scenario in which the periodic CSI-RS has less spatial coverage than the SS block.
  • the UE can find an SS block of better quality than all the CSI-RSs set.
  • the UE may then request beam failover to the network via the BFR (s) associated with the SS block (s) having good quality (e.g., above the threshold, RSRP / CQI better than the RS for the serving control channel) .
  • good quality e.g., above the threshold, RSRP / CQI better than the RS for the serving control channel
  • the UE finds at least one CSI-RS resource satisfying a predefined condition.
  • 'find' or 'find' can be interpreted in the same sense as 'choose'.
  • the UE does not find a CSI-RS resource satisfying a predefined condition, and finds at least one SS block satisfying a predefined condition.
  • the UE does not find a CSI-RS resource satisfying a predefined condition, and recognizes that there is no SS block satisfying a predefined condition.
  • candidate SS blocks can be identified by a UL resource configuration for beam failure recovery.
  • the predefined condition may be expressed as a specific condition and may be, for example, a higher quality than a set (or predefined) threshold, or better quality than supporting a CSI-RS / SS block.
  • the threshold may also be set by the base station, which may mean a value used to determine if a candidate beam (associated with the identity) RS can be used for beam failover.
  • Proposal 2 shows that when a CSI-RS is set up for new beam identification, when a beam failure event occurs (i.e., when all serving control channels fail) Operation can be defined.
  • the predefined condition may be (i) a quality is higher than a set (or predefined) threshold, or (ii) quality is better than a serving CSI-RS (or SS block).
  • the predefined condition may be expressed by a specific condition.
  • the UE requests beam failure recovery (to the base station) through the BFR (s) corresponding to the SS block (s) spatially QCL (quasi-co-located) with the CSI-RS (s) satisfying the condition.
  • BFR means beam failure recovery request resource, PRACH used for beam failure recovery request and UL resource which is FDM, CDM or TDM.
  • An RRC configuration may be supported so that each BFR is associated with an SS block or CSI-RS.
  • the PRACH sequence may be an example of the BFR.
  • the UE requests beam failure recovery (to the base station) via the BFR (s) corresponding to the CSI-RS (s) satisfying the above conditions.
  • the UE requests beam failure recovery through the BFR (s) corresponding to the SS block (s) satisfying the predefined condition.
  • the predefined condition may be when (i) the quality is higher than a configured (or predefined) threshold, or (ii) the quality is better than the serving CSI-RS (or SS block).
  • the UE initiates a radio link failure recovery procedure (or initiates an appropriate timer). And /
  • the UE performs a higher layer procedure by declaring an unsuccessful beam failure recovery. And /
  • the UE does not send any signal through the BFR. And /
  • the UE operation may be an operation in which the SS block is limited to SS blocks indicated in the BFR configuration.
  • the UE operation described in Case 2 may be performed by the UE It can be limited to finding a satisfying SS block and including the SS block in the BFR configuration.
  • the CSI-RS is set in the BFR configuration in Case 2 and / or the CSI-RS is set in the BFR configuration in Case 2 and the SS block and the CSI-RS resource that the UE finds do not belong to the corresponding setting . ≪ / RTI >
  • the 'pre-defined condition' can be applied not only to predefined conditions but also to conditions set by the network.
  • the beam failure recovery request resource may be a PRACH-like resource.
  • NR supports using the CDM resource with other PRACH resources as the beam failure recovery request resource.
  • the configuration is UE-specific so that the network can manage the entire resource, and reconfigurable to the RRC if coordination is needed.
  • the network may set the FDM resources to the UE.
  • PRACH resources and CDM resources may be used for transmission of the beam failure recovery request on the PRACH.
  • a physical uplink control channel may be used as the beam failure recovery request resource.
  • a beam failure is declared only when all serving control channels fail.
  • the PUCCH resource may be used for fast beam fail recovery requests.
  • the PUCCH is used to notify the network of the occurrence of the event.
  • the event may be a beam failure recovery request signaling that a beam failure has occurred.
  • the UE may send a CSI-RS resource indicator (CRI) without any additional RS reception or measurement ) Can be directly reported to the base station.
  • CRI CSI-RS resource indicator
  • the DL RS configuration for new beam identification and reporting may be independent of the DL RS configuration for association with the BFR.
  • SS blocks may be associated with a BFR while some beam is present and the CSI-RSs are set by the network to report the new beam (via CRI).
  • the UE may find a new beam with higher resolution among periodic CSI-RS resources.
  • both the SSB and the CSI-RS correspond to the case where the quality is better than the threshold value set by the base station (serving as a reference of the candidate beam setting).
  • the quality may indicate RSRP or CQI.
  • the present invention can be applied to a case where the UE finds (or selects) both the SSB and the CSI-RS as the candidate beam RS having a quality higher than the threshold value.
  • both CSI-RSs and SSBs can be used for new beam identification, as set below.
  • the CSI-RSs are indirectly associated with the PRACHs through the QCB association with the SSB (s).
  • SSBs are directly associated with PRACHs for beam failure recovery requests, and periodic CSI-RS resources are QCLed with one or more SSBs.
  • UE operations can be defined.
  • the UE requests beam failure recovery through the corresponding PRACH (s) with SS blocks, and the SS blocks are spatially QCL with CSI-RS (s) satisfying a specific condition (or a predefined condition) .
  • the network does not need to transmit (or instruct) the CSI-RS for beam refinement, and the UL container to report the CRI + L1-RSRP (reference signal received power) ).
  • the predefined condition (or a specific condition) may be (i) a quality is higher than a set threshold value (or a predefined threshold value) or (ii) quality is better than a serving CSI-RS Lt; / RTI >
  • the UE requests beam failure recovery through the PRACH (s) corresponding to the SS blocks satisfying the predefined condition.
  • the UE initiates a radio link failure recovery procedure.
  • the terminal receives control information related to a candidate beam setting for beam failure recovery from the base station (S1710).
  • control information includes a RS set including a reference signal (RS) associated with the candidate beam identification, and a threshold for the beam failure recovery.
  • RS reference signal
  • the RS set may include at least one of a synchronization signal (SS) block or at least one channel state information (CSI) -RS.
  • SS synchronization signal
  • CSI channel state information
  • step S1720 the MS selects an RS having a quality equal to or higher than the threshold value among the RSs associated with the candidate beam identification.
  • the quality may be RSRP, CQI, and the like.
  • step S1730 the MS transmits a beam failure recovery request based on an uplink (UL) resource associated with the selected RS to the BS.
  • UL uplink
  • the UL resource associated with the selected RS includes (i) a meaning of the case where the selected RS and the UL resource are associated with each other, (ii) a candidate beam RS satisfying the above- And may include all of the meanings when UL resources are associated.
  • the UL resource may be a resource related to a physical random access channel (PRACH).
  • PRACH physical random access channel
  • the UL resource may be a PRACH preamble, and may be a contention-free physical random access channel (PRACH) preamble.
  • PRACH physical random access channel
  • the selected RS may be an SS block or a CSI-RS.
  • the selected RS is an SS block
  • the UL resource is associated with the SS block, and more detailed contents will be referred to above.
  • the UL resource may be a resource corresponding to an SS block that is quasi-co-located with the CSI-RS.
  • the SS block may be associated with the UL resource.
  • the SS block can be directly associated with the UL resource, and the CSI-RS indirectly associates with the UL resource through the QCL association with the SS block. .
  • the SS block and the CSI-RS are candidate beam RSs satisfying the predefined conditions (or specific conditions).
  • FIG. 18 is a flowchart showing an example of a method of operating a base station for beam failure recovery proposed in the present specification.
  • the base station transmits control information related to the candidate beam setting for beam failure recovery to the terminal (S1810).
  • control information may include an RS set including a reference signal RS related to the candidate beam identification, and a threshold for the beam failure recovery.
  • step S1820 the BS receives a beam failure recovery request from the MS on an uplink (UL) resource associated with a particular RS.
  • UL uplink
  • the specific RS may be an RS having a quality higher than or equal to the threshold value among the RSs associated with the candidate beam identification.
  • FIG. 19 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present invention.
  • the wireless communication system includes a base station (or network) 1910 and a terminal 1920.
  • the base station 1910 includes a processor 1911, a memory 1912, and a communication module 1913.
  • the processor 1911 implements the functions, processes and / or methods proposed in FIGS. 1 to 18 above.
  • the layers of the wired / wireless interface protocol may be implemented by the processor 1911.
  • the memory 1912 is connected to the processor 1911 and stores various information for driving the processor 1911.
  • the communication module 1913 is connected to the processor 1911 to transmit and / or receive a wired / wireless signal.
  • the communication module 1913 may include a radio frequency unit for transmitting / receiving a radio signal.
  • the terminal 1920 includes a processor 1921, a memory 1922, and a communication module (or RF section) 1923.
  • Processor 1921 implements the functions, processes, and / or methods suggested above in FIGS. 1-18.
  • the layers of the air interface protocol may be implemented by the processor 1921.
  • the memory 1922 is connected to the processor 1921 and stores various information for driving the processor 1921.
  • the communication module 1923 is connected to the processor 1921 to transmit and / or receive a radio signal.
  • the base station 1910 and / or the terminal 1920 may have a single antenna or multiple antennas.
  • FIG. 20 illustrates a block diagram of a communication apparatus according to an embodiment of the present invention.
  • FIG. 20 illustrates the terminal of FIG. 19 in more detail.
  • a terminal includes a processor (or a digital signal processor (DSP) 2010, an RF module (or RF unit) 2035, a power management module 2005
  • An antenna 2040 a battery 2055, a display 2015, a keypad 2020, a memory 2030, a SIM (Subscriber Identification Module ) card 2025 (this configuration is optional), a speaker 2045 and a microphone 2050.
  • the terminal may also include a single antenna or multiple antennas .
  • Processor 2010 implements the functions, processes, and / or methods suggested earlier in FIGS. 1-18.
  • the layer of the air interface protocol may be implemented by a processor.
  • Memory 2030 is coupled to the processor and stores information related to the operation of the processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by any of a variety of well known means.
  • the user inputs command information such as a telephone number or the like by, for example, pressing (or touching) a button on the keypad 2020 or by voice activation using the microphone 2050.
  • the processor 2010 receives such command information and processes it to perform appropriate functions, such as dialing a telephone number. Operational data may be extracted from the sim card 2025 or from the memory 2030. In addition, the processor 2010 may display command information or drive information on the display 2015 for the user to recognize and for convenience.
  • RF module 2035 is coupled to processor 2010 to transmit and / or receive RF signals.
  • the processor 2010 forwards the command information to the RF module 2035 to transmit, for example, a wireless signal that constitutes voice communication data, to initiate communication.
  • the RF module 2035 is comprised of a receiver and a transmitter for receiving and transmitting radio signals.
  • the antenna 2040 functions to transmit and receive a radio signal.
  • the RF module 2035 can transfer the signal for processing by the processor 2010 and convert the signal to baseband.
  • the processed signal can be converted into audible or readable information output through the speaker 2045.
  • 21 is a diagram showing an example of an RF module of a wireless communication apparatus to which the method suggested in the present specification can be applied.
  • FIG. 21 shows an example of an RF module that can be implemented in an FDD (Frequency Division Duplex) system.
  • FDD Frequency Division Duplex
  • the processor described in FIGS. 19 and 20 processes the data to be transmitted and provides an analog output signal to the transmitter 2110.
  • the analog output signal is filtered by a low pass filter (LPF) 2111 to remove images caused by a digital-to-analog conversion (ADC) Mixer 2112 and is amplified by a variable gain amplifier (VGA) 2113.
  • the amplified signal is filtered by a filter 2114 and amplified by a power amplifier Amplifier, PA) 2115 and is routed through duplexer (s) 2150 / antenna switch (s) 2160 and transmitted via antenna 2170.
  • antenna 2170 receives signals from the outside and provides received signals that are routed through antenna switch (s) 2160 / duplexers 2150, .
  • the received signals are amplified by a Low Noise Amplifier (LNA) 2123, filtered by a bandpass filter 2124 and filtered by a down converter (Mixer 2125) And downconverted to the baseband.
  • LNA Low Noise Amplifier
  • McMixer 2125 a down converter
  • the down-converted signal is filtered by a low-pass filter (LPF) 2126 and amplified by VGA 2127 to obtain an analog input signal, which is provided to the processor described in FIGS.
  • LPF low-pass filter
  • a local oscillator (LO) generator 2140 also provides transmit and receive LO signals to the upconverter 2112 and downconverter 2125, respectively.
  • phase locked loop (PLL) 2130 receives control information from the processor to generate transmit and receive LO signals at appropriate frequencies and provides control signals to LO generator 2140.
  • PLL phase locked loop
  • circuits shown in Fig. 21 may be arranged differently from the configuration shown in Fig.
  • FIG. 22 is a diagram showing another example of an RF module of a wireless communication apparatus to which the method suggested in the present specification can be applied.
  • FIG. 22 shows an example of an RF module that can be implemented in a TDD (Time Division Duplex) system.
  • TDD Time Division Duplex
  • the transmitter 2210 and receiver 2220 of the RF module in the TDD system are identical in structure to the transmitter and receiver of the RF module in the FDD system.
  • the signal amplified by the power amplifier (PA) 2215 of the transmitter is routed through a band select switch (Band Select Switch) 2250, a band pass filter (BPF) 2260 and an antenna switch (s) And is transmitted through the antenna 2280.
  • a band select switch Band Select Switch
  • BPF band pass filter
  • s antenna switch
  • antenna 2280 receives signals from the outside to provide received signals, which are passed through antenna switch (s) 2270, band pass filter 2260 and band select switch 2250 And is provided to receiver 2220.
  • Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above.
  • the software code can be stored in memory and driven by the processor.
  • the memory is located inside or outside the processor and can exchange data with the processor by various means already known.

Abstract

La présente invention concerne un procédé de reprise sur défaillance de faisceau dans un système de communication sans fil. Le procédé de reprise sur défaillance de faisceau mis en œuvre par un terminal, selon la présente invention, comprend les étapes consistant à : recevoir, en provenance d'une station de base, des informations de commande associées à une configuration de faisceau candidat pour une reprise sur défaillance de faisceau ; sélectionner, parmi des signaux de référence (RS) associés à l'identification du faisceau candidat, un RS ayant un niveau de qualité qui est supérieur ou égal à une valeur seuil ; et transmettre une demande de reprise sur défaillance de faisceau à la station de base sur la base d'une ressource de liaison montante (UL) associée au RS sélectionné.
PCT/KR2018/010645 2017-09-11 2018-09-11 Procédé de récupération de faisceau dans un système de communication sans fil, et dispositif associé WO2019050380A1 (fr)

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EP18854806.9A EP3644677A4 (fr) 2017-09-11 2018-09-11 Procédé de récupération de faisceau dans un système de communication sans fil, et dispositif associé
KR1020187038064A KR102156286B1 (ko) 2017-09-11 2018-09-11 무선 통신 시스템에서 빔 복구를 수행하는 방법 및 이를 위한 장치
US16/332,351 US10784950B2 (en) 2017-09-11 2018-09-11 Method for performing beam failure recovery in wireless communication system and apparatus therefor
JP2020509502A JP7110328B2 (ja) 2017-09-11 2018-09-11 無線通信システムにおけるビーム失敗復旧を行う方法、及びこのための装置
CN201880046656.3A CN110915276B (zh) 2017-09-11 2018-09-11 无线通信系统中的波束恢复方法及其设备
US16/996,571 US11329713B2 (en) 2017-09-11 2020-08-18 Method for performing beam failure recovery in wireless communication system and apparatus therefor

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US16/996,571 Continuation US11329713B2 (en) 2017-09-11 2020-08-18 Method for performing beam failure recovery in wireless communication system and apparatus therefor

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US10784950B2 (en) 2020-09-22
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EP3644677A4 (fr) 2020-07-08
US20190253127A1 (en) 2019-08-15
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US11329713B2 (en) 2022-05-10
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